Lock



O. H. BENKE Sept. 23 1924.

LOCK

Filed Aug. r11;. 1923 lll Patented Sept. 23, 1924,`

UNITED STATES PATENT OFFICE.

OTTO H. BENKE, OIF ST'AIVIFORD, CONNECTICUT, ASSIGNOR TO THE YALE &TOWNE MANUFACTURING COMPANY,

oF sTAivrroan, CONNECTICUT.

LOCK.

Application filed August 14, 1923.

T0 all whom t may concern.'

Be it known that I, @Tiro I-I. BENKE, a citizen of the United States,and a resident of Stamford, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements in Locks;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to whichit appertains to make and use the same. f

This invention relates to improvements in locks and more particularly tothose of the rim type and embodying a cylinder loclr one object of theinvention being to provide means whereby the bolt operating cam will bereleased from its mounting in the event that the cylinder loci: bewrenched from its normal position.

With this object in view, the invention consists in certain novelfeatures of construction as will hereinafter be more fully described andpointed out in the claim.

In the accompanying drawings,h

Figure l is a face view of a cover plate showing an application of theinvention.

Figure 2 is a sectional view on the line 2HE of Figure l, and

Figure 8 is a sectional view on the line 3 3 of Figure 1.

A sheet metal cover plate is illustrated at l and is provided with holes2 for the accommodation of bolts for securing a cylinder lool; in place.A plate 3 is mounted on the cover plate 1 and is secured thereto bymeans of rivets 4, the ends of which are but slightly upset so that uponthe application of a pulling or wrenching force, said plate 3 maybecome. removed from the cover Serial No. 657,278.

plate. A roll bacl; 5 is mounted in the cover plate and also in theplate 3 and one end portion of this roll back passes through a suitablehole in a roll back cam or bolt operating member 6 and its free end isslightly upset as at 7. The plate 3 is provided with holes (two or more)to align with holes 2 in the cover plate and the last mentioned holesare sufiieiently large to permit the passage of the heads of thesecuring bolts so that said heads may bear directly against the plate 3.

W7 ith my improvements, if an attempt be made to wrench or pull thecylinder lock from the door,

or thimble 5 would be stripped from the roll back cam, thus releasingthe latter and permitting it to drop and be, therefore, renderedinoperable to retract the bolt.

Having fully described my invention what I claim as new and desire tosecure by Letters-Patent, is:

The combination with the cover a rim lock, of a plate removably securedto said cover plate, a roll back mounted in said. plate, a roll back camremovably secured to said roll back, said plates having aligning boltholes, the bolt holes in the cover plate being suiiiciently large topermit the heads of cylinder securing bolts 'to the removable plate.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

plate of OTTO H. BENKE. ilf'itnesses HARRY N. SMITH, CHARLES A. BERRY.

the plate 3 would be pulled` away from the cover plate and the roll backseat against

